How Can I Efficiently Read File Content Line by Line or All at Once in C ?

Reading File Content Effectively

In programming, handling files efficiently is crucial. While reading a file one word at a time is feasible, practical considerations demand more efficient techniques for substantial files. This article explores methods to read either line by line or the entire content at once.

Consider a text file named "Read.txt" containing the following text:

I love to play games
I love reading
I have 2 books

Line-by-Line Reading

The std::getline function can read a single line of text from a file:

#include <fstream>
#include <string>

int main() {
    std::ifstream file("Read.txt");
    std::string line;
    while (std::getline(file, line)) {
        // Process line
    }
}

Reading the Entire File at Once

To read the entire file at once, concatenate the retrieved lines using a string buffer:

#include <fstream>
#include <string>

int main() {
    std::ifstream file("Read.txt");
    std::string line;
    std::string file_contents;
    while (std::getline(file, line)) {
        file_contents += line;
        file_contents.push_back('\n');
    }
}

In conclusion, using std::getline offers efficient methods for reading a file line by line or obtaining the entire content at once. These techniques allow for flexible and effective file handling in programming.

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